Driving power supply and power supply system

Abstract

The invention provides a driving power supply and a power supply system, the driving power supply comprises a control module, a push-pull circuit and a transformation output module, a first input end and a second input end of the control module are connected with a signal generation module which outputs two paths of complementary PWM signals; a first output end of the control module is connected with a first control end of the push-pull circuit, a second output end is connected with a second control end of the push-pull circuit, a first output signal and a second output signal are respectively output, and the first output signal and the second output signal are complementary; the first input end and the second input end of the push-pull circuit are connected with the voltage transformation output module, the output end of the push-pull circuit is grounded, and the push-pull circuit is conducted when the first control end / the second control end is connected with a high level, so that the voltage transformation output module outputs voltage to a load. The driving power supply adopting the scheme is low in cost and simple and rapid in output adjustment.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a driving power supply and a power supply system. Background Art

[0002] There is more or less communication between different circuit systems, and in cross-system communication, both data transmission and power supply need to be isolated to protect the internal system. Therefore, when designing circuits for communication between different systems, it is necessary to consider isolating different systems, such as isolating high and low voltage systems, isolating different equipment systems, etc.

[0003] Common isolation methods include photoelectric isolation, relay isolation, transformer isolation, isolation amplifier, etc. Transformer isolation is commonly used for power supply isolation, isolating the input power supply and output power supply into two independent power supply systems. For example, the most commonly used isolated power supplies include flyback power supply topology and push-pull drive power supply topology. The flyback power supply topology can achieve isolated power supply of the primary and secondary sides through a transformer, and use primary or secondary side feedback to achieve a stable output voltage.

[0004] The flyback power supply topology generally only has a single MOS tube to work, which requires a MOSFET with a large voltage resistance and is expensive. Moreover, if the output voltage of the current power supply topology needs to be modified during the test process, the circuit needs to be modified in hardware, such as adjusting the feedback resistor size, which is relatively complicated and cumbersome. Therefore, the existing power supply cost is high and the output adjustment is cumbersome. Summary of the invention

[0005] The present application provides a driving power supply and a power supply system to solve the above-mentioned technical problems in the prior art.

[0006] According to a first aspect of the present application, a driving power supply is provided, comprising a control module, a push-pull circuit and a voltage conversion output module, wherein the control module comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, and the push-pull circuit comprises a first control terminal, a second control terminal, a first input terminal, a second input terminal and an output terminal;

[0007] The first input terminal and the second input terminal of the control module are connected to a signal generating module that outputs two complementary PWM signals, the first input terminal of the control module is connected to the first PWM signal, and the second input terminal of the control module is connected to the second PWM signal; the first output terminal of the control module is connected to the first control terminal of the push-pull circuit, the second output terminal is connected to the second control terminal of the push-pull circuit, the first output terminal outputs a first output signal to the first control terminal, and the second output terminal outputs a second output signal to the second control terminal, and the first output signal and the second output signal are complementary;

[0008] The first input terminal and the second input terminal of the push-pull circuit are connected to the voltage conversion output module, the output terminal of the push-pull circuit is grounded, and the push-pull circuit is turned on when the first control terminal / the second control terminal is connected to a high level, so that the voltage conversion output module is powered on and works;

[0009] The voltage conversion output module is also used to connect to a load, and the voltage conversion output module outputs voltage to the load when powered on.

[0010] In some embodiments, the push-pull circuit includes a first MOS transistor and a second MOS transistor, the input end of the first MOS transistor serves as the first input end of the push-pull circuit, and is used to connect the voltage conversion output module; the control end of the first MOS transistor serves as the first control end of the push-pull circuit, and is used to connect the first output end of the control module to access the first output signal; the input end of the second MOS transistor serves as the second input end of the push-pull circuit, and is used to connect the voltage conversion output module; the control end of the second MOS transistor serves as the second control end of the push-pull circuit, and is used to connect the second output end of the control module to access the second output signal; and the connection node of the output ends of the first MOS transistor and the second MOS transistor serves as the output end of the push-pull circuit;

[0011] When the first output signal is at a high level and the second output signal is at a low level, the first MOS tube is turned on and the second MOS tube is turned off; when the first output signal is at a low level and the second output signal is at a high level, the first MOS tube is turned off and the second MOS tube is turned on; the voltage transformer output module is powered on and operates when the first MOS tube is turned on or the second MOS tube is turned on.

[0012] In some embodiments, the transformer output module includes a transformer, a rectifier output circuit, a positive output terminal and a negative output terminal, the primary side of the transformer is connected to the first input terminal of the push-pull circuit and the second input terminal of the push-pull circuit, the secondary side of the transformer is connected to the rectifier output circuit, and the rectifier output circuit is connected to the load through the positive output terminal and the negative output terminal.

[0013] In some embodiments, the primary side of the transformer includes a first primary winding and a second primary winding, the secondary side of the transformer includes a first secondary winding and a second secondary winding, and the rectifier output circuit includes a first rectifier circuit and a second rectifier circuit;

[0014] The first end of the first primary winding and the first end of the second primary winding are connected in common and connected to an auxiliary power supply, the second end of the first primary winding is connected to the first input end of the push-pull circuit, and the second end of the second primary winding is connected to the second input end of the push-pull circuit;

[0015] The first end of the first secondary winding and the first end of the second secondary winding are connected in common and connected to the negative output end, the second end of the first secondary winding is connected to the input end of the first rectifier circuit, the second end of the second secondary winding is connected to the input end of the second rectifier circuit, and the output end of the first rectifier circuit and the output end of the second rectifier circuit are connected to the positive output end.

[0016] In some embodiments, the rectifier output circuit also includes a resonant inductor and a resonant capacitor, one end of the resonant inductor is connected to the output end of the first rectifier circuit and the output end of the second rectifier circuit, the other end of the resonant inductor is connected to the positive output end, and the resonant capacitor is connected between the positive output end and the negative output end.

[0017] In some embodiments, the control module includes a dual-channel driver chip, which includes two input pins and two output pins. The two input pins serve as the first input end and the second input end of the control module, respectively, and are used to connect the signal generating module. The two output pins serve as the first output end and the second output end of the control module, respectively, and are used to connect the push-pull circuit.

[0018] According to a second aspect of the present application, a power supply system is provided, comprising a signal generating module and the above-mentioned driving power supply, wherein the signal generating module is connected to a control module of the driving power supply and is used to output two complementary PWM signals to a first input terminal and a second input terminal of the control module.

[0019] In some implementations, when the signal generation module receives a frequency modification instruction, it modifies the frequencies of the two PWM signals according to the frequency modification instruction;

[0020] When receiving the duty cycle modification instruction, the signal generating module modifies the duty cycles of the two PWM signals according to the duty cycle modification instruction.

[0021] In some implementations, upon receiving a shutdown instruction, the signal generating module turns off the output of the PWM signal.

[0022] In some embodiments, the signal generating module is a motor controller.

[0023] In summary, the driving power supply and power supply system provided by the present application have at least the following beneficial effects:

[0024] The control module receives two complementary PWM signals through two input terminals, and outputs two complementary output signals through two output terminals, thereby alternately outputting high levels through the two output terminals, which is used to drive the push-pull circuit to conduct, so that the transformer output module is powered on to output voltage. On the one hand, since the push-pull circuit has two switch tubes, compared with the existing single switch tube, a switch tube with a relatively low withstand voltage can be selected, which can reduce costs. On the other hand, since the output of the transformer output module is controlled by the control module outputting two complementary output signals based on the two complementary PWM signals, under different working conditions, the output voltage of the transformer output module can be quickly adjusted by inputting PWM signals with different frequencies and duty cycles. Therefore, when the output voltage needs to be modified, only the frequency and duty cycle of the input PWM signal need to be adjusted, and there is no need to modify the hardware circuit, and the adjustment process is simpler and faster. Therefore, the driving power supply of the present application can reduce costs and improve the convenience and adjustment efficiency of output adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present application, the drawings required for use in the specific implementation methods will be briefly introduced below in conjunction with the accompanying drawings. It is obvious that the drawings described below are some implementation methods of the present application. For those skilled in the art, other drawings or solutions can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A circuit structure diagram of a driving power supply provided for one embodiment of the present application;

[0027] Figure 2 A circuit schematic diagram of a driving power supply provided for another embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the above and other features and advantages of the present application more clear, the present application is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0029] In the following description, many specific details are set forth to provide a thorough understanding of the present application. However, it is apparent to those skilled in the art that specific details need not be adopted to practice the present application. In other cases, well-known steps or operations are not described in detail to avoid blurring the present application.

[0030] This application provides a driving power supply, referring to Figure 1The driving power supply includes a control module 110, a push-pull circuit 120 and a transformer output module 130. The control module 110 includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, and the push-pull circuit 120 includes a first control terminal, a second control terminal, a first input terminal, a second input terminal and an output terminal.

[0031] The first input terminal and the second input terminal of the control module 110 are connected to the signal generation module, wherein the signal generation module is used to output two complementary PWM (Pulse-width modulation) signals. The two PWM signals are complementary, which means that the signal phases of the two PWM signals differ by 180 degrees and the duty cycles are complementary, that is, the sum of the duty cycles is 1, so that in one signal cycle, when one PWM signal is at a high level, the other PWM signal is at a low level. Furthermore, the frequencies of the two PWM signals can be the same. For example, Figure 1 PWMA in the figure represents the first PWM signal, and PWMB represents the second PWM signal. In one signal cycle, when PWMA is at a high level, PWMB is at a low level, or when PWMA is at a low level, PWMB is at a high level. The first input terminal of the control module 110 is connected to the first PWM signal, and the second input terminal of the control module 110 is connected to the second PWM signal. Since the first PWM signal and the second PWM signal are complementary, the polarities of the signals inputted by the control module 110 are reversed (the phase difference of the signals is 180 degrees). Based on the inputted first PWM signal and the second PWM signal, the control module 110 can output two complementary output signals at the same time, so that the polarities of the two output signals are opposite. Specifically, the first output end of the control module 110 is connected to the first control end of the push-pull circuit 120 to output the first output signal to the first control end of the push-pull circuit 120 through the first output end; the second output end of the control module 110 is connected to the second control end of the push-pull circuit 120 to output the second output signal to the second control end of the push-pull circuit 120 through the second output end. The first output signal and the second output signal have opposite polarities. When the first output signal is high, the second output signal is low, and when the first output signal is low, the second output signal is high, so that the two paths output high levels alternately.

[0032] The first input end of the push-pull circuit 120 and the second input end of the push-pull circuit 120 are connected to the transformer output module 130, and the output end of the push-pull circuit 120 is grounded. Specifically, the push-pull circuit is a circuit composed of two switch tubes, one switch tube is connected to one of the control ends and one of the input ends, and the output ends of the two switch tubes are grounded. The push-pull circuit 120 is turned on when any one of the first control end and the second control end is connected to a high level, so that the transformer output module 120 is powered on. Specifically, when any one of the first output end and the second output end of the control module 110 outputs a high level, the switch tube corresponding to the high level in the push-pull circuit 120 can be driven to turn on, and the push-pull circuit 120 is turned on, so that the transformer output module 120 is powered on. If the first output end and the second output end of the control module 110 both output a low level, the two switch tubes are turned off, the push-pull circuit 120 is not turned on, and the transformer output module 120 stops being powered on.

[0033] The voltage conversion output module 130 is also used to connect to a load. Specifically, when the voltage conversion output module 130 is powered on, it outputs a voltage to the load to supply power to the load.

[0034] In the above-mentioned driving power supply, the control module 110 receives two complementary PWM signals through two input terminals, and outputs two complementary output signals through two output terminals, so that the two output terminals alternately output high levels, which are used to drive the push-pull circuit 120 to conduct, so that the transformer output module 130 is powered on to output voltage. On the one hand, since the push-pull circuit 120 has two switch tubes, compared with the existing single switch tube, a switch tube with a relatively low withstand voltage can be selected, which can reduce costs. On the other hand, since the output of the transformer output module 130 is controlled by the control module 110 outputting two complementary output signals based on the two complementary PWM signals, under different working conditions, the output voltage of the transformer output module 130 can be quickly adjusted by inputting PWM signals with different frequencies and duty cycles. Therefore, when the output voltage needs to be modified, only the frequency and duty cycle of the input PWM signal need to be adjusted, and the hardware circuit does not need to be modified, and the adjustment process is simpler and faster. Therefore, the driving power supply of the present application can reduce costs and improve the convenience and efficiency of output adjustment.

[0035] In one embodiment, reference Figure 2 The control module 110 includes a dual-channel driving chip U1, which includes two input pins and two output pins. The two input pins serve as the first input end and the second input end of the control module 110, respectively, and are used to connect to the signal generating module. The two output pins serve as the first output end and the second output end of the control module 110, respectively, and are used to connect to the push-pull circuit 120.

[0036] For example, Figure 2The input pin INA of the dual-channel driver chip U1 serves as the first input end of the control module 110, the input pin INB of the dual-channel driver chip U1 serves as the second input end of the control module 110, the output pin OUTA of the dual-channel driver chip U1 serves as the first output end of the control module 110, and the output pin OUTB of the dual-channel driver chip U1 serves as the second output end of the control module 110. The input pin INA is connected to the first PWM signal PWMA output by the signal generation module, the input pin INB is connected to the second PWM signal PWMB output by the signal generation module, and the dual-channel driver chip U1 follows the output signal corresponding to the output PWMA through the output pin OUTA, and follows the output signal corresponding to the output PWMB through the output pin OUTB. Specifically, when PWMA is at a high level, PWMB is at a low level, so that the output pin OUTA outputs a high level and the output pin OUTB outputs a low level. At this time, the push-pull circuit 120 is driven to be turned on by the output signal of the output pin OUTA; when PWMA is at a low level, PWMB is at a high level, so that the output pin OUTA outputs a low level and the output pin OUTB outputs a high level. At this time, the push-pull circuit 120 is driven to be turned on by the output signal of the output pin OUTB. In this way, the two inputs are complementary and the two outputs are complementary to achieve alternating drive.

[0037] Specifically, the dual-channel driver chip U1 also includes other pins, such as Figure 2 The ground pin GND and the power pin VDD in the present application are not specifically limited.

[0038] By using a dual-channel driver chip U1, the two inputs are complementary and the two outputs are complementary, so as to realize the alternate driving of the push-pull circuit 120. Under different working conditions, the frequency and duty cycle of PWMA and PWMB can be adjusted by the signal generation module, so that the output voltage of the transformer output module 130 can be adjusted. The output adjustment method is simple and efficient, and when the output voltage does not deviate from the nominal value, the system loss can be reduced and the system energy efficiency can be improved.

[0039] In one embodiment, the dual-channel driver chip U1 can use a driver chip model FAN3216TMX-F08. After collecting the input signal, the driver chip outputs a large current signal. The output of the large current signal can meet the fast switching control of the switch tube in the push-pull circuit 120.

[0040] In one embodiment, reference Figure 2The push-pull circuit 120 includes a first MOS transistor Q1 and a second MOS transistor Q2. The input end of the first MOS transistor Q1 serves as the first input end of the push-pull circuit 120, which is used to connect to the voltage-converting output module 130. The control end of the first MOS transistor Q1 serves as the first control end of the push-pull circuit 120, which is used to connect to the first output end of the control module 110, so as to access the first output signal. The input end of the second MOS transistor Q2 serves as the second input end of the push-pull circuit 120, which is used to connect to the voltage-converting output module 130. The control end of the second MOS transistor Q2 serves as the second control end of the push-pull circuit 120, which is used to connect to the second output end of the control module 110, so as to access the second output signal. The connection node of the output ends of the first MOS transistor Q1 and the second MOS transistor Q2 serves as the output end of the push-pull circuit 120, and the output end is grounded.

[0041] When the first output signal is at a high level and the second output signal is at a low level, the first control terminal inputs a high level and the second control terminal inputs a low level, so that the first MOS transistor Q1 is turned on and the second MOS transistor is turned off. When the first output signal is at a low level and the second output signal is at a high level, the first control terminal inputs a low level and the second control terminal inputs a high level, so that the first MOS transistor Q1 is turned off and the second MOS transistor Q2 is turned on. The voltage transformer output module 130 is powered on and works when the first MOS transistor Q1 is turned on or the second MOS transistor Q2 is turned on.

[0042] By using two MOS tubes as switching tubes, the power consumption is low and the switching speed is fast. Compared with the flyback topology structure that only uses one MOS tube, the two MOS tubes can be selected with lower voltage resistance, thereby reducing hardware costs.

[0043] In one embodiment, reference Figure 2 The transformer output module 130 includes a transformer T1, a rectifier output circuit 131, a positive output terminal V0+ and a negative output terminal V0-, the primary side of the transformer T1 is connected to the first input terminal of the push-pull circuit 120 and the second input terminal of the push-pull circuit 120, the secondary side of the transformer T1 is connected to the rectifier output circuit 131, and the rectifier output circuit 131 is connected to the load through the positive output terminal V0+ and the negative output terminal V0-.

[0044] The transformer T1 is used for voltage transformation and output, and the rectifier output circuit 131 rectifies and outputs the voltage output by the transformer T1. By using the rectifier output circuit 131 after the transformer T1 to process the voltage output by the voltage transformation, the stability of the output voltage is improved.

[0045] In one embodiment, if Figure 2As shown, the primary side of the transformer T1 includes a first primary winding P1 and a second primary winding P2, the secondary side of the transformer T1 includes a first secondary winding S1 and a second secondary winding S2, and the rectifier output circuit 131 includes a first rectifier circuit and a second rectifier circuit.

[0046] The first end of the first primary winding P1 and the first end of the second primary winding P2 are connected in common and connected to an auxiliary power source, for example Figure 2 Through port V IN The auxiliary power supply is connected, and the auxiliary power supply is used to supply power to the two primary windings. The second end of the first primary winding P1 is connected to the first input end of the push-pull circuit 120, and the second end of the second primary winding P2 is connected to the second input end of the push-pull circuit 120.

[0047] The first end of the first secondary winding S1 and the first end of the second secondary winding S2 are connected in common and connected to the negative output terminal V0-, the second end of the first secondary winding S1 is connected to the input terminal of the first rectifier circuit, the second end of the second secondary winding S2 is connected to the input terminal of the second rectifier circuit, and the output terminal of the first rectifier circuit and the output terminal of the second rectifier circuit are connected to the positive output terminal V0+.

[0048] Specifically, port V IN The connected auxiliary power supply is the positive electrode of the signal required by the two primary windings, and the first MOS transistor Q1 and the second MOS transistor Q2 of the push-pull circuit 120 are used as switches to connect the negative electrodes of the signals required by the two primary windings. When the first MOS transistor Q1 is turned on and the second MOS transistor Q2 is turned off, the port V IN The input current will flow through the first primary winding P1 of the transformer T1 and then be grounded after passing through the first MOS tube Q1, while the second MOS tube Q2 will prevent the current from flowing through the second primary winding P2 of the transformer T1. The current flow direction is: V IN Input→first primary winding P1→first MOS tube Q1→ground. The second end of the first secondary winding S1 on the secondary side of transformer T1 outputs the induced current to the first rectifier circuit, and flows to the positive output terminal V0+ through the first rectifier circuit. Similarly, when the second MOS tube Q2 is turned on and the first MOS tube Q1 is turned off, the port V IN The input current will flow through the second primary winding P2 of the transformer T1 and then pass through the second MOS tube Q2 to ground, while the first MOS tube Q1 will prevent the current from flowing through the first primary winding P1 of the transformer T1. The current flow direction is: V INInput→second primary winding P2→second MOS tube Q2→ground; the second end of the second secondary winding S2 on the secondary side of transformer T1 outputs the induced current to the second rectifier circuit, and flows to the positive output terminal V0+ through the second rectifier circuit. Whenever the current changes, transformer T1 transfers energy from the primary side to the secondary side, and the voltages at the positive output terminal V0+ and the negative output terminal V0- remain stable.

[0049] By using a transformer T1 including two primary windings and two secondary windings, alternate power-on operation is achieved when either the first MOS transistor Q1 or the second MOS transistor Q2 is turned on, thereby ensuring the stability and reliability of the output voltage. At the same time, each of the two secondary windings is connected to a rectifier circuit to rectify the output of the two secondary windings, respectively, so that the current output is stable.

[0050] In one embodiment, the rectifier output circuit 131 also includes a resonant inductor L and a resonant capacitor C2, one end of the resonant inductor L is connected to the output end of the first rectifier circuit and the output end of the second rectifier circuit, the other end of the resonant inductor L is connected to the positive output end V0+, and the resonant capacitor C2 is connected between the positive output end V0+ and the negative output end V0-.

[0051] The resonant inductor L and the resonant capacitor C2 form an LC resonant circuit. The induced electromotive force generated by any secondary winding on the secondary side of the transformer T1 transfers energy to output the required voltage through the LC resonant circuit, which can improve the stability of the output voltage.

[0052] In one embodiment, reference Figure 2 , the first rectifier circuit includes a diode D2, and the second rectifier circuit includes a diode D1; the anode of the diode D2 is connected to the second end of the first secondary winding S1 as the input end of the first rectifier circuit, and the cathode of the diode D2 is connected to the positive output end V0+ through the resonant inductor L as the output end of the first rectifier circuit. The anode of the diode D1 is connected to the second end of the second secondary winding S2 as the input end of the second rectifier circuit, and the cathode of the diode D1 is connected to the positive output end V0+ through the resonant inductor L as the output end of the second rectifier circuit.

[0053] By using diodes for rectification, the circuit structure is simple. It can be understood that in other embodiments, the first rectifier circuit and the second rectifier circuit can also use other rectifier circuit structures, which are not limited in this application, as long as they can achieve rectification.

[0054] The present application also provides a power supply system, including a signal generating module and a driving power supply in each of the above embodiments, wherein the signal generating module is connected to the control module 110 of the driving power supply, specifically, to the first input terminal and the second input terminal of the control module 110. The signal generating module is used to output two complementary PWM signals to the first input terminal and the second input terminal of the control module 110, specifically, the signal generating module outputs a first PWM signal to the first input terminal of the control module 110 through a first port, and the signal generating module outputs a second PWM signal to the second input terminal of the control module 110 through a second port.

[0055] The above-mentioned power supply system provides two complementary PWM signals to the control module 110 of the driving power supply in the above-mentioned embodiments through the signal generating module; similarly, on the one hand, a switch tube with relatively low voltage resistance can be used to reduce costs; on the other hand, the output voltage can be adjusted by adjusting the frequency and duty cycle of the PWM signal output by the signal generating module, without modifying the hardware circuit, and the adjustment process is simpler and faster.

[0056] In one embodiment, when the signal generation module receives a frequency modification instruction, it modifies the frequencies of the two PWM signals according to the frequency modification instruction. When the signal generation module receives a duty cycle modification instruction, it modifies the duty cycles of the two PWM signals according to the duty cycle modification instruction.

[0057] Among them, the frequency modification instruction is used to control the modification of the frequency of the PWM signal, and the duty cycle modification instruction is used to control the modification of the duty cycle of the PWM signal. Specifically, the frequency modification instruction and the duty cycle modification instruction can be input by the user operating the hardware, such as pressing the frequency modification button or pressing the duty cycle modification button, then correspondingly, the signal generation module will receive the frequency modification instruction or the duty cycle modification instruction. It can be understood that the frequency modification instruction and the duty cycle modification instruction can also be obtained by other means, and this application does not limit this.

[0058] In the traditional power supply topology, the conventional push-pull topology sets the operating frequency of the circuit by using a capacitor-resistor matching power management chip. The frequency adjustment is cumbersome, and during the test process, if the output voltage needs to be modified, the circuit needs to be modified in hardware, such as adjusting the feedback resistor size, etc., which is relatively complicated and cumbersome. In the present application, the signal generation module can modify the PWM signal according to the frequency modification instruction / duty cycle modification instruction, thereby adjusting the output voltage of the transformer output module 130 in the driving power supply, and the adjustment is simple and quick.

[0059] In one embodiment, the signal generation module turns off the output of the PWM signal when receiving the shutdown instruction, that is, stops outputting the PWM signal. Specifically, after turning off the PWM signal, the two PWM signals can be output again when receiving the start instruction.

[0060] Specifically, the shutdown command can be input by the user operating the hardware, such as pressing a signal shutdown button. When debugging and testing the driving power supply, within the cycle of the input PWM signal, if the voltage output by the transformer output module 130 is stable above the nominal value of the transformer secondary winding voltage, in order to reduce the loss, a shutdown command can be input to control the shutdown of the PWM signal, so that the control module 110 has no high-level output, so that the first MOS tube Q1 and the second MOS tube Q2 of the push-pull circuit 120 are both turned off, reducing system losses to prevent the subsequent voltage from deviating from the nominal value.

[0061] In one embodiment, the signal generating module is a motor controller (MCU). The motor controller outputs two PWM signals to the control module 110 through two IO (input and output) ports.

[0062] In order to adapt to the development trend of new energy vehicles, the motor drive control requires a smaller, simpler and more reliable power supply. In this embodiment, the motor controller outputs a PWM signal to drive the connected drive power supply, so that the peripheral circuit components of the drive power supply are fewer, and a larger power current can be output to meet the fast switching control of the switch tube in the push-pull circuit 120, so that the drive power supply is small in size, simple in structure and more reliable.

[0063] The various technical features described above can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as there is no contradiction in such combination.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A driving power supply, characterized in that: It includes a control module, a push-pull circuit and a voltage conversion output module, wherein the control module includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, and the push-pull circuit includes a first control terminal, a second control terminal, a first input terminal, a second input terminal and an output terminal; The first input terminal and the second input terminal of the control module are connected to a signal generating module that outputs two complementary PWM signals, the first input terminal of the control module is connected to the first PWM signal, and the second input terminal of the control module is connected to the second PWM signal; the first output terminal of the control module is connected to the first control terminal of the push-pull circuit, the second output terminal is connected to the second control terminal of the push-pull circuit, the first output terminal outputs a first output signal to the first control terminal, and the second output terminal outputs a second output signal to the second control terminal, and the first output signal and the second output signal are complementary; The first input terminal and the second input terminal of the push-pull circuit are connected to the voltage conversion output module, the output terminal of the push-pull circuit is grounded, and the push-pull circuit is turned on when the first control terminal / the second control terminal is connected to a high level, so that the voltage conversion output module is powered on and works; The voltage conversion output module is also used to connect to a load, and the voltage conversion output module outputs voltage to the load when powered on.

2. The driving power supply according to claim 1, characterized in that: The push-pull circuit includes a first MOS transistor and a second MOS transistor, the input end of the first MOS transistor serves as the first input end of the push-pull circuit and is used to connect the voltage conversion output module, the control end of the first MOS transistor serves as the first control end of the push-pull circuit and is used to connect the first output end of the control module to access the first output signal, the input end of the second MOS transistor serves as the second input end of the push-pull circuit and is used to connect the voltage conversion output module, the control end of the second MOS transistor serves as the second control end of the push-pull circuit and is used to connect the second output end of the control module to access the second output signal, and the connection node of the output ends of the first MOS transistor and the second MOS transistor serves as the output end of the push-pull circuit; When the first output signal is at a high level and the second output signal is at a low level, the first MOS tube is turned on and the second MOS tube is turned off; when the first output signal is at a low level and the second output signal is at a high level, the first MOS tube is turned off and the second MOS tube is turned on; the voltage transformer output module is powered on and operates when the first MOS tube is turned on or the second MOS tube is turned on.

3. The driving power supply according to claim 1 or 2, characterized in that: The transformer output module includes a transformer, a rectifier output circuit, a positive output terminal and a negative output terminal. The primary side of the transformer is connected to the first input terminal of the push-pull circuit and the second input terminal of the push-pull circuit. The secondary side of the transformer is connected to the rectifier output circuit. The rectifier output circuit is connected to the load via the positive output terminal and the negative output terminal.

4. The driving power supply according to claim 3, characterized in that: The primary side of the transformer includes a first primary winding and a second primary winding, the secondary side of the transformer includes a first secondary winding and a second secondary winding, and the rectifier output circuit includes a first rectifier circuit and a second rectifier circuit; The first end of the first primary winding and the first end of the second primary winding are connected in common and connected to an auxiliary power supply, the second end of the first primary winding is connected to the first input end of the push-pull circuit, and the second end of the second primary winding is connected to the second input end of the push-pull circuit; The first end of the first secondary winding and the first end of the second secondary winding are connected in common and connected to the negative output end, the second end of the first secondary winding is connected to the input end of the first rectifier circuit, the second end of the second secondary winding is connected to the input end of the second rectifier circuit, and the output end of the first rectifier circuit and the output end of the second rectifier circuit are connected to the positive output end.

5. The driving power supply according to claim 4, characterized in that: The rectifier output circuit also includes a resonant inductor and a resonant capacitor, one end of the resonant inductor is connected to the output end of the first rectifier circuit and the output end of the second rectifier circuit, the other end of the resonant inductor is connected to the positive output end, and the resonant capacitor is connected between the positive output end and the negative output end.

6. The driving power supply according to claim 1, characterized in that: The control module includes a dual-channel driving chip, which includes two input pins and two output pins. The two input pins serve as the first input end and the second input end of the control module, respectively, and are used to connect the signal generating module. The two output pins serve as the first output end and the second output end of the control module, respectively, and are used to connect the push-pull circuit.

7. A power supply system, characterized in that: It comprises a signal generating module and a driving power supply as described in any one of claims 1 to 6, wherein the signal generating module is connected to a control module of the driving power supply and is used to output two complementary PWM signals to a first input terminal and a second input terminal of the control module.

8. The power supply system according to claim 7, characterized in that: When the signal generating module receives the frequency modification instruction, the frequency of the two PWM signals is modified according to the frequency modification instruction; When receiving the duty cycle modification instruction, the signal generating module modifies the duty cycles of the two PWM signals according to the duty cycle modification instruction.

9. The power supply system according to claim 7, characterized in that: The signal generating module turns off the output of the PWM signal when receiving a turn-off instruction.

10. The power supply system according to claim 7, characterized in that: The signal generating module is a motor controller.

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